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12.
Assembly lines are usually constructed as the last stage of the entire production system and efficiency of an assembly line is one of the most important factors which affect the performance of a complex production system. The main purpose of this paper is to mathematically formulate and to provide an insight for modelling the parallel two-sided assembly line balancing problem, where two or more two-sided assembly lines are constructed in parallel to each other. We also propose a new genetic algorithm (GA)-based approach in alternatively to the existing only solution approach in the literature, which is a tabu search algorithm. To the best of our knowledge, this is the first formal presentation of the problem as well as the proposed algorithm is the first attempt to solve the problem with a GA-based approach in the literature. The proposed approach is illustrated with an example to explain the procedures of the algorithm. Test problems are solved and promising results are obtained. Statistical tests are designed to analyse the advantage of line parallelisation in two-sided assembly lines through obtained test results. The response of the overall system to the changes in the cycle times of the parallel lines is also analysed through test problems for the first time in the literature. 相似文献
13.
With the rapid development of the virtual world industry in the past few years, trading of virtual goods and services has grown significantly. Virtual goods creators can set different permissions to their creations, such as the length of usage, the ability to copy or modify a virtual good, or the ability to give the good to others. The permissions of virtual goods endow their creators with additional power to control the allocation and exchange of virtual goods in a virtual world. We examine how the unique virtual goods permission settings (copy, modify, and transfer) and other factors are associated with virtual goods prices. Using data from a Second Life marketplace, we find that permissions of virtual goods are not random, as creators strategically set the permissions for their virtual creations. Our results show that the copy and transfer permissions are significant factors associated with virtual goods prices. The impact of other factors on virtual goods prices is analyzed and managerial implications are discussed. 相似文献
14.
This paper considers a supply chain with one supplier and multiple retailers that face exogenous heterogeneous end‐customer demands, where all parties utilize base‐stock policies. Each retailer is restricted to order once in every order cycle and their orders are replenished in a balanced manner within the cycle. Our study investigates the impact of information sharing and advance order information (AOI) on the supply chain. We find that the supplier benefits from the two mechanisms via two important factors, the information about observed end‐customer demands and the decision on re‐establishing the replenishment sequence. We derive the supplier's optimal sequence for stochastically comparable end‐customer demands with AOI and propose a sequencing rule for the setting with information sharing. Our numerical study examines the cost impacts of two proposed mechanisms on the entire supply chain. 相似文献
15.
Zaixin Lu Wei Zhang Weili Wu Joonmo Kim Bin Fu 《Journal of Combinatorial Optimization》2012,24(3):374-378
The influence maximization is an important problem in the field of social network. Informally it is to select few people to be activated in a social network such that their aggregated influence can make as many as possible people active. Kempe et al. gave a $(1-{1 over e})$ -approximation algorithm for this problem in the linear threshold model and the independent cascade model. In addition, Chen et al. proved that the exact computation of the influence given a seed set is #P-hard in the linear threshold model. Both of the two models are based on randomized propagation, however such information might be obtained by surveys and data mining techniques. This will make great difference on the complexity of the problem. In this note, we study the complexity of the influence maximization problem in deterministic linear threshold model. We show that in the deterministic linear threshold model, there is no n 1??? -factor polynomial time approximation for the problem unless P=NP. We also show that the exact computation of the influence given a seed set can be solved in polynomial time. 相似文献
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17.
构建高不确定环境下中国企业外部取向管理创新模式选择机理的组织创新氛围-企业家精神维度的研究框架,通过质性数据分析方法,辅以ATLAS.ti质性数据分析软件,使用16家企业的数据对两个影响维度的测量指标进行细化和量化,在此基础上采用案例研究小组评分法,基于对组织创新氛围和企业家精神维度指标的测量,选取淘宝的商业模式创新以及绿盛、天翼咨询和正泰电器的营销模式创新的多案例分析对研究框架进行探索性分析.研究结果表明,高不确定环境下外部取向管理创新模式主要包括激进式、元素式、结构式和渐进式4类,外部取向管理创新模式的选择是在组织创新氛围和企业家精神的主导作用下进行的,而当两者均较弱时外部环境成为渐进式外部取向管理创新模式的主要推动因素. 相似文献
18.
先前经验、学习风格与创业能力的实证研究 总被引：3，自引：0，他引：3
如何提升创业者的创业能力是目前创业实践中亟待解决的问题。在将经验和能力区分开的基础上,从创业学习的视角出发,深入挖掘创业者先前经验与创业能力之间的作用关系机制,探讨创业者经验向创业能力转化的内在机理,采用探索性因子分析、验证性因子分析、层级回归分析等方法,对173家中国新创企业的调查问卷进行分析。研究结果表明,学习风格在创业者先前经验与创业能力的关系中发挥调节作用,不同类型的先前经验对不同类型的创业能力产生影响,创业者的学习风格也并非像以往研究所认为的那样存在优劣之分,而是存在一个匹配关系,当创业者的信息获取/转化方式与他的先前经验类型相匹配时,这一类型的经验才能更好的转化为创业能力。 相似文献
19.
本文采用结构分解分析SDA模型对1990-2005年江苏省经济发展变化的源泉进行了实证研究。主要结论:第一,江苏经济增长长期主要靠消费拉动,中期则更多地依赖投资驱动;第二,技术变化长期对降低三次产业中间消耗需求发挥了显著作用,但中期对第一、第二产业的影响不大;第三,技术进步改善了对绝大多数行业的中间消耗,尤其是对采掘业和资本密集型制造业;第四,消费对现代服务业的促进作用较大,而资本形成对采掘业及部分资本密集型、技术知识密集型行业影响较大;第五,煤炭采选业、电力等行业总产出的变化受制于省际间净调出变化,而服装皮革及其他纤维制品制造业受净出口增加的影响,充分反映出江苏资源、市场两头在外的经济结构特征。 相似文献
20.
跨国公司理论由垄断优势理论和内部化理论强调的市场交易性失效观点过渡到了知识基础观理论强调的市场在能力上的不完善源于对知识特征看法的演变。因此以知识为着眼点在MNCs理论领域描绘一个清晰的研究纲要,系统地梳理各理论对知识属性看法以及其对跨国公司本质分析的演变,对于构建在跨国公司领域更加折中的分析框架是有益的。 相似文献
